Wikipedia defines information warfare as a concept involving the battlespace use and management of information and communication technology (ICT) in pursuit of a competitive advantage over an opponent s. Military scholars trace the modern use of information as a tool in fifth-century BC Chinese military strategist Sun Tzu. In the more recent past, information warfare has been used in the form of propaganda dropped over the civil-war conflicts in Somalia to persuade locals that the U.S. forces were there to help, and that a peaceful resolution could be established.
Source: https://threatpost.com/information-warfare-power-misinformation/147452/